Microscopic image fusion method based on region growing

ABSTRACT

A microscopic image fusion method based on region growing judges the fuzzy degree of the microscopic image and determines the fuzzy seed block by evaluating the definition of every image block in the microscopic image. Then, the fuzzy region and clear region are exactly segmented by region growing and are marked. Finally, a clear and high-quality microscopic image, fused by a plurality of microscopic images, is obtained. Due to the combination of the definition evaluation of the microscopic image, and segmentation of the fuzzy region and clear region by region growing, the fusion results of the microscopic image of the present invention show great advantages at the subjective human perception and the objective evaluation. Furthermore, the present invention has simple calculation and stable result, is easy to be implemented and adapted for fusing the digital optical microscopic images which are shot by shallow depth of field.

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to an image processing technology, andmore particularly to a microscopic image fusion method based on regiongrowing.

2. Description of Related Arts

In the optical microscope imaging system, with the increase of themagnification, the depth of field is getting smaller and smaller.Therefore, only those targets at the focal plane or the vicinity thereofare clearly visible, so that even if it has the simplest structure andthe relatively flat three-dimensional depth, it is impossible for theobject to completely clearly focus in an image. In practicalapplications of many fields, it is required that the microscopic imagingshould not only have high magnification, but also reach a sufficientdepth of field, such as the fiber observation of textile industry andthe quality inspection of printed circuit board industry. To resolve theabove-mentioned technical problem, it is required that the focal lengthof the optical microscope should be constantly adjusted for obtaining aseries of partially clear images, and then the series of partially clearimages are inputted into a computer for fusing to obtain the completeand clear image of an object in the whole space. Therefore, thedisadvantage that only one focal plane of an object is clearly visiblewhile directly observing by an optical microscope, and the complete andclear image of the object in the whole space are invisible is overcome.

The existing image fusion method is mainly divided into threecategories: the pixel-level image fusion method, the feature-level imagefusion method and the decision-level image fusion method. Thepixel-level image fusion method fuses on the foundation level. Its mainadvantage is that the fused image contains as many original data aspossible, and the accuracy of the fusion is highest, thereby providingthe detail information which other fusion levels cannot provide. Ingeneral, it processes pixels in the transform domain by means of thewavelet transform or other transformation methods, thus it hasrelatively higher fusion complexity. The feature-level image fusionmethod acquires the information from the pre-processed andfeature-extracted original input image, such as the comprehensivetreatment of the contour, shape, edge and region information. Generally,its implementation needs more empirical parameters. For variableobjects, the instability of theirs feature extraction will bring thedeviation to the fusion. The decision-level image fusion method makesthe optimal fusion decision according to certain criteria and thefeasible degree of every decision. However, due to a variety of decisioncriteria, it needs manual intervention and is difficult to achieve theautomatic fusion.

SUMMARY OF THE PRESENT INVENTION

The technical problem to be resolved of the present invention is toprovide a microscopic image fusion method based on region growing, whichhas simple calculation and stable results, and is capable of effectivelyimproving the results of subjective perception and objective evaluation.

To resolve the above-mentioned technical problem, the technical solutionof the present invention is described as follows. A microscopic imagefusion method based on region growing is characterized by comprisingsteps of:

(1) setting {I_(S1)(x,y)} to one microscopic image collected under anoptical microscope, and setting {I_(S2)(x,y)} to another microscopicimage collected under the optical microscope, wherein 0≦x≦W−1, 0≦y≦H−1,W denotes the width of an image, H denotes the height of the image,I_(S1)(x,y) denotes a pixel value of a pixel point whose coordinateposition is (x,y) in the {I_(S1)(x,y)}, and I_(S2)(x,y) denotes a pixelvalue of a pixel point whose coordinate position is (x,y) in the{I_(S2)(x,y)};

(2) dividing the {I_(S1)(x,y)} into

$\frac{W \times H}{n \times n}$non-overlapping first image blocks, each of which having a size of n×n,recording a first image block with a coordinate position of (i,j) in the{I_(S1)(x,y)} as I_(B1) _(—) _(n)(i,j), dividing the {I_(S2)(x,y)} into

$\frac{W \times H}{n \times n}$non-overlapping second image blocks, each of which having a size of n×n,and recording a second image block with a coordinate position of (i,j)in the {I_(S2)(x,y)} as I_(B2) _(—) _(n)(i,j), wherein

${0 \leq i \leq {\frac{W}{n} - 1}},{0 \leq j \leq {\frac{H}{n} - 1}},$and n is 2-power;

(3) evaluating a definition of every first image block in the{I_(S1)(x,y)} for obtaining a definition characteristic valuecorresponding to every first image block in the {I_(S1)(x,y)}, andrecording a corresponding definition characteristic value thereof asF_(v1) _(—) _(n)(i,j) for the first image block I_(B1) _(—) _(n)(i,j)with the coordinate position of (i,j) in the {I_(S1)(x,y)};

evaluating a definition of every second image block in the {I_(S2)(x,y)}for obtaining a definition characteristic value corresponding to everysecond image block in the {I_(S2)(x,y)}, and recording a correspondingdefinition characteristic value thereof as F_(v2) _(—) _(n)(i,j) for thesecond image block I_(B2) _(—) _(n)(i,j) with the coordinate position of(i,j) in the {I_(S2)(x,y)};

(4) determining a first decision threshold of the definitioncharacteristic value corresponding to every first image block in the{I_(S1)(x,y)}, recording the first decision threshold as T_(n) _(—) ₁;and then judging whether every first image block in the {I_(S1)(x,y)} isa fuzzy seed block according to the definition characteristic valuecorresponding to every first image block in the {I_(S1)(x,y)} and thefirst decision threshold T_(n) _(—) ₁, wherein for the first image blockI_(B1) _(—) _(n)(i,j) with the coordinate position of (i,j) in the{I_(S1)(x,y)}, judge whether the definition characteristic value F_(v1)_(—) _(n)(i,j) corresponding to the I_(B1) _(—) _(n)(i,j) is smallerthan the first decision threshold T_(n) _(—) ₁, if it's OK, then judgethe I_(B1) _(—) _(n)(i,j) as the fuzzy seed block and set a mark M_(B1)_(—) _(n)(i,j) of every pixel point in the I_(B1) _(—) _(n)(i,j) to 1,if not, judge the I_(B1) _(—) _(n)(i,j) as the non-fuzzy seed block andset the mark M_(B1) _(—) _(n)(i,j) of every pixel point in the I_(B1)_(—) _(n)(i,j) to 0; and then according to the mark M_(B1) _(—)_(n)(i,j) of every pixel point in every first image block in the{I_(S1)(x,y)}, calculating a definition tagged image corresponding tothe {I_(S1)(x,y)} and recording the definition tagged image as {I_(D1)_(—) _(n)(x,y)}, wherein I_(D1) _(—) _(n)(x,y)=M_(B1) _(—)_(n)(int(x/n),int(y/n)), I_(D1) _(—) _(n)(x,y) denotes a mark of a pixelpoint with a coordinate position of (x,y) in the {I_(D1) _(—)_(n)(x,y)}, and int( ) is a rounding operator;

determining a second decision threshold of the definition characteristicvalue corresponding to every second image block in the {I_(S2)(x,y)},recording the second decision threshold as T_(n) _(—) ₂; and thenjudging whether every second image block in the {I_(S2)(x,y)} is a fuzzyseed block according to the definition characteristic valuecorresponding to every second image block in the {I_(S2)(x,y)} and thesecond decision threshold T_(n) _(—) ₂, wherein for the second imageblock I_(B2) _(—) _(n)(i,j) with the coordinate position of (i,j) in the{I_(S2)(x,y)}, judge whether the definition characteristic value F_(v2)_(—) _(n)(i,j) corresponding to the I_(B2) _(—) _(n)(i,j) is smallerthan the second decision threshold T_(n) _(—) ₂, if it's OK, judge theI_(B2) _(—) _(n)(i,j) as the fuzzy seed block and set a mark M_(B2) _(—)_(n)(i,j) of every pixel point in the I_(B2) _(—) _(n)(i,j) to 1, ifnot, judge the I_(B2) _(—) _(n)(i,j) as the non-fuzzy seed block and setthe mark M_(B2) _(—) _(n)(i,j) of every pixel point in the I_(B2) _(—)_(n)(i,j) to 0; and then according to the mark M_(B2) _(—) _(n)(i,j) ofevery pixel point in every second image block in the {I_(S2)(x,y)},calculating a definition tagged image corresponding to the {I_(S2)(x,y)}and recording the definition tagged image as {I_(D2) _(—) _(n)(x,y)},wherein I_(D2) _(—) _(n)(x,y)=M_(B2) _(—) _(n)(int(x/n),int(y/n)),I_(D2) _(—) _(n)(x,y) denotes a mark of a pixel point with a coordinateposition of (x,y) in the {I_(D2) _(—) _(n)(x,y)}, and int( ) is arounding operator;

(5) setting n=128, n=64, n=32, n=16 and n=8, respectively repeatingsteps (3) to (4) for obtaining a definition tagged image {I_(D1) _(—)₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} and a definition taggedimage {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the {I_(S2)(x,y)} whilen=128; a definition tagged image {I_(D1) _(—) ₆₄(x,y)} corresponding tothe {I_(S1)(x,y)} and a definition tagged image {I_(D2) _(—) ₆₄(x,y)}corresponding to the {I_(S2)(x,y)} while n=64; a definition tagged image{I_(D1) _(—) ₃₂(x,y)} corresponding to the {I_(S1)(x,y)} and adefinition tagged image {I_(D2) _(—) ₃₂(x,y)} corresponding to the{I_(S2)(x,y)} while n=32; a definition tagged image {I_(D1) _(—)₁₆(x,y)} corresponding to the {I_(S1)(x,y)} and a definition taggedimage {I_(D2) _(—) ₁₆(x,y)} corresponding to the {I_(S2)(x,y)} whilen=16; a definition tagged image {I_(D1) _(—) ₈(x,y)} corresponding tothe {I_(S1)(x,y)} and a definition tagged image {I_(D2) _(—) ₈(x,y)}corresponding to the {I_(S2)(x,y)} while n=8;

(6) based on the pixel points with the mark of 1 in the {I_(D1) _(—)₁₂₈(x,y)}, {I_(D1) _(—) ₆₄(x,y)}, {I_(D1) _(—) ₃₂(x,y)}, {I_(D1) _(—)₁₆(x,y)} and {I_(D1) _(—) ₈(x,y)}, making a fuzzy region growing forobtaining a region growing image corresponding to the {I_(S1)(x,y)} andrecording the region growing image as {I_(G1)(x,y)}, wherein I_(G1)(x,y)denotes a mark of a pixel point with a coordinate position of (x,y) inthe {I_(G1)(x,y)};

based on the pixel points with the mark of 1 in the {I_(D2) _(—)₁₂₈(x,y)}, {I_(D2) _(—) ₆₄(x,y)}, {I_(D2) _(—) ₃₂(x,y)}, {I_(D2) _(—)₁₆(x,y)} and {I_(D2) _(—) ₈(x,y)}, making a fuzzy region growing forobtaining a region growing image corresponding to the {I_(S2)(x,y)} andrecording the region growing image as I_(G2)(x,y), wherein I_(G2)(x,y)denotes a mark of a pixel point with a coordinate position of (x,y) inthe {I_(G2)(x,y)}; and

(7) according to the region growing image {I_(G1)(x,y)} corresponding tothe {I_(S1)(x,y)} and the region growing image {I_(G2)(x,y)}corresponding to the {I_(S2)(x,y)}, fusing the {I_(S1)(x,y)} and the{I_(S2)(x,y)} for obtaining a final fusion microscopic image andrecording the final fusion microscopic image as {I_(F)(x,y)}, wherein

${I_{F}( {x,y} )} = \{ \begin{matrix}{{I_{S\; 1}( {x,y} )},} & {{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {{0\mspace{14mu}{and}\mspace{14mu}{I_{G\; 2}( {x,y} )}} = 1}} \\{{I_{S\; 2}( {x,y} )},} & {{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {{1\mspace{14mu}{and}\mspace{14mu}{I_{G\; 2}( {x,y} )}} = 0}} \\C & {{{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {I_{G\; 2}( {x,y} )}},}\end{matrix} $here, I_(F)(x,y) denotes a pixel value of a pixel point with acoordinate position of (x,y) in the {I_(F)(x,y)},

$C = \{ \begin{matrix}{{I_{S\; 1}( {x,y} )},} & {{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} < {C_{{nt}\; 2}( {x,y} )}} \\{{I_{S\; 2}( {x,y} )},} & {{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} > {C_{{nt}\; 2}( {x,y} )}} \\{\frac{{I_{S\; 1}( {x,y} )} + {I_{S\; 2}( {x,y} )}}{2},} & {{{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} = {C_{{nt}\; 2}( {x,y} )}},}\end{matrix} $C_(nt1)(x,y) denotes an amount of pixel points with a mark of 1 in an 8neighbor of the pixel point with a coordinate position of (x,y) in the{I_(G1)(x,y)}, and C_(nt2)(x,y) denotes an amount of pixel points with amark of 1 in an 8 neighbor of the pixel point with a coordinate positionof (x,y) in the {I_(G2)(x,y)}.

In step (3), the concrete process of calculating the definitioncharacteristic value F_(v1) _(—) _(n)(i,j) corresponding to the firstimage block I_(B1) _(—) _(n)(i,j) with the coordinate position of (i,j)in the {I_(S1)(x,y)} comprises steps of: (3-a1) using the improvedTenenGrad gradient function to calculate a horizontal gradient and avertical gradient of every pixel point in the I_(B1) _(—) _(n)(i,j),wherein for a pixel point with a coordinate position of (x₁,y₁) in theI_(B1) _(—) _(n)(i,j), respectively record the horizontal gradient andthe vertical gradient thereof as G_(h1)(x₁,y₁) and G_(v1)(x₁,y₁),whereinG _(h1)(x ₁ ,y ₁)=(f ₁(x ₁−1,y ₁−1)+2f ₁(x ₁ ,y ₁−1)+f ₁(x ₁+1,y₁−1))−(f ₁(x ₁−1,y ₁+1)+2f ₁(x ₁ ,y ₁+1)+f ₁(x ₁+1,y ₁+1)),G _(v1)(x ₁ ,y ₁)=(f ₁(x ₁+1,y ₁−1)+2f ₁(x ₁+1,y ₁)+f ₁(x ₁+1,y ₁+1))−(f₁(x ₁−1,y ₁−1)+2f ₁(x ₁−1,y ₁)+f ₁(x ₁−1,y ₁+1)),here, 0≦x₁≦n−1, 0≦y₁≦n−1, f₁(x₁−1,y₁−1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁−1,y₁−1) in the I_(B1) _(—)_(n)(i,j), f₁(x₁,y₁−1) denotes a pixel value of a pixel point with acoordinate position of (x₁,y₁−1) in the I_(B1) _(—) _(n)(i,j),f₁(x₁+1,y₁−1) denotes a pixel value of a pixel point with a coordinateposition of (x₁+1,y₁−1) in the I_(B1) _(—) _(n)(i,j), f₁(x₁−1,y₁+1)denotes a pixel value of a pixel point with a coordinate position of(x₁−1,y₁+1) in the I_(B1) _(—) _(n)(i,j), f₁(x₁,y₁+1) denotes a pixelvalue of a pixel point with a coordinate position of (x₁,y₁+1) in theI_(B1) _(—) _(n)(i,j), f₁(x₁+1,y₁+1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁+1,y₁+1) in the I_(B1) _(—)_(n)(i,j), f₁(x₁+1,y₁) denotes a pixel value of a pixel point with acoordinate position of (x₁+1,y₁) in the I_(B1) _(—) _(n)(i,j), andf₁(x₁−1,y₁) denotes a pixel value of a pixel point with a coordinateposition of (x₁−1,y₁) in the I_(B1) _(—) _(n)(i,j); and (3-a2) accordingto the horizontal gradient and the vertical gradient of every pixelpoint in the I_(B1) _(—) _(n)(i,j), calculating the definitioncharacteristic value F_(v1) _(—) _(n)(i,j) corresponding to the I_(B1)_(—) _(n)(i,j), wherein,

${F_{v\; 1{\_ n}}( {i,j} )} = {\sum\limits_{{x\; 1} = 0}^{n - 1}\;{\sum\limits_{{y\; 1} = 0}^{n - 1}\;{( {{G_{v\; 1}^{2}( {x_{1},y_{1}} )} + {G_{h\; 1}^{2}( {{x\; 1},{y\; 1}} )}} ).}}}$

In step (3), the concrete process of calculating the definitioncharacteristic value F_(v2) _(—) _(n)(i,j) corresponding to the secondimage block I_(B2) _(—) _(n)(i,j) with the coordinate position of (i,j)in the {I_(S2)(x,y)} comprises steps of: (3-b1) using the improvedTenenGrad gradient function to calculate a horizontal gradient and avertical gradient of every pixel point in the I_(B2) _(—) _(n)(i,j),wherein for a pixel point with a coordinate position of (x₁,y₁) in theI_(B2) _(—) _(n)(i,j), respectively record the horizontal gradient andthe vertical gradient thereof as G_(h2)(x₁,y₁) and G_(v2)(x₁,y₁),whereinG _(h2)(x ₁ ,y ₁)=(f ₂(x ₁−1,y ₁−1)+2f ₂(x ₁ ,y ₁−1)+f ₂(x ₁+1,y₁−1))−(f ₂(x ₁−1,y ₁+1)+2f ₂(x ₁ ,y ₁+1)+f ₂(x ₁+1,y ₁+1)),G _(v2)(x ₁ ,y ₁)=(f ₂(x ₁+1,y ₁−1)+2f ₂(x ₁+1,y ₁)+f ₂(x ₁+1,y ₁+1))−(f₂(x ₁−1,y ₁−1)+2f ₂(x ₁−1,y ₁)+f ₂(x ₁−1,y ₁+1))here, 0≦x₁≦n−1, 0≦y₁≦n−1, f₂(x₁−1,y₁−1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁−1,y₁−1) in the I_(B2) _(—)_(n)(i,j), f₂(x₁,y₁−1) denotes a pixel value of a pixel point with acoordinate position of (x₁,y₁−1) in the I_(B2) _(—) _(n)(i,j),f₂(x₁+1,y₁−1) denotes a pixel value of a pixel point with a coordinateposition of (x₁+1, y₁−1) in the I_(B2) _(—) _(n)(i,j), f₂(x₁−1,y₁+1)denotes a pixel value of a pixel point with a coordinate position of(x₁−1,y₁+1) in the I_(B2) _(—) _(n)(i,j), f₂(x₁,y₁+1) denotes a pixelvalue of a pixel point with a coordinate position of (x₁,y₁+1) in theI_(B2) _(—) _(n)(i,j), f₂(x₁+1,y₁+1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁+1,y₁+1) in the I_(B2) _(—)_(n)(i,j), f₂(x₁+1,y₁) denotes a pixel value of a pixel point with acoordinate position of (x₁+1,y₁) in the I_(B2) _(—) _(n)(i,j), andf₂(x₁−1,y₁) denotes a pixel value of a pixel point with a coordinateposition of (x₁−1,y₁) in the I_(B2) _(—) _(n)(i,j); and (3-b2) accordingto the horizontal gradient and the vertical gradient of every pixelpoint in the I_(B2) _(—) _(n)(i,j), calculating the definitioncharacteristic value F_(v2) _(—) _(n)(i,j) corresponding to the I_(B2)_(—) _(n)(i,j), wherein,

${F_{v\; 2{\_ n}}( {i,j} )} = {\sum\limits_{{x\; 1} = 0}^{n - 1}\;{\sum\limits_{{y\; 1} = 0}^{n - 1}\;{( {{G_{v\; 2}^{2}( {x_{1},y_{1}} )} + {G_{h\; 2}^{2}( {{x\; 1},{y\; 1}} )}} ).}}}$

In step (4), the concrete process of determining the first decisionthreshold T_(n) _(—) ₁ of the definition characteristic valuecorresponding to every first image block in the {I_(S1)(x,y)} comprisessteps of: (4-a1) sequencing the definition characteristic valuecorresponding to every first image block in the {I_(S1)(x,y)}, findingout a maximum definition characteristic value and a minimumcharacteristic value, and respectively recording the maximum definitioncharacteristic value and the minimum characteristic value as F_(v1) _(—)_(n) _(—) _(MAX) and F_(v1) _(—) _(n) _(—) _(MIN); and (4-a2)calculating the first decision threshold T_(n) _(—) ₁, wherein T_(n)_(—) ₁=F_(v1) _(—) _(n) _(—) _(MIN)+(F_(v1) _(—) _(n) _(—) _(MAX)−F_(v1)_(—) _(n) _(—) _(MIN))−w₁, here, w₁ is a weight factor.

In step (4), the concrete process of determining the second decisionthreshold T_(n) _(—) ₂ of the definition characteristic valuecorresponding to every second image block in the {I_(S2)(x,y)} comprisessteps of: (4-b1) sequencing the definition characteristic valuecorresponding to every second image block in the {I_(S2)(x,y)}, findingout a maximum definition characteristic value and a minimumcharacteristic value, and respectively recording the maximum definitioncharacteristic value and the minimum characteristic value as F_(v2) _(—)_(n) _(—) _(MAX) and F_(v2) _(—) _(n) _(—) _(MIN); and (4-b2)calculating the second decision threshold T_(n) _(—) ₂, wherein T_(n)_(—) ₂=F_(v2) _(—) _(n) _(—) _(MIN)+(F_(v2) _(—) _(n) _(—) _(MAX)−F_(v2)_(—) _(n) _(—) _(MIN))×w₂, here, w₂ is a weight factor.

In (4-a2) of step (4), 0.4≦w₁≦0.6; and in (4-b2) of step (4),0.4≦w₂≦0.6.

In step (6), the acquisition process of the region growing image{I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprises steps of:(6-a1) while n=128, regarding the definition tagged image {I_(D1) _(—)₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a starting seed image;(6-a2) studying 8 image blocks each of which having a size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in the{I_(S1)(x,y)}, wherein if the mark

$I_{D\; 1\_\;\frac{n}{2}}( {x,y} )$corresponding to every pixel point in the image block with the size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in {I_(S1)(x,y)}is 1, then a mark of every pixel point in the image block with the sizeof

$\frac{n}{2} \times \frac{n}{2}$at the same position in the starting seed image is set to 1; (6-a3)setting

${n = \frac{n}{2}};$and returning to step (6-a2) till n=8, here, “=” is an assignment symbolin

${n = \frac{n}{2}};$and (6-a4) while n=8, directly setting a mark of every pixel point inimage blocks in the starting seed image to 1, wherein the image blocksin the starting seed image has the same position with 8 image blocks,each of which having a size of 4×4, adjacent to every fuzzy seed blockwith a size of 8×8 in the {I_(S1)(x,y)}; and then setting n=4, anddirectly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has the same position with 8 image blocks, each of which having asize of 2×2, adjacent to every fuzzy seed block with a size of 4×4 inthe {I_(S1)(x,y)}; and then setting n=2, and directly setting the markof 8 pixel points in the starting seed image to 1, wherein the 8 pixelpoints in the starting seed image has the same position with the 8 pixelpoints adjacent to every fuzzy seed block with a size of 2×2 in the{I_(S1)(x,y)}, thereby obtaining the region growing image {I_(G1)(x,y)}corresponding to the {I_(S1)(x,y)}, wherein the pixel point in{I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)} is 1 is a fuzzypixel point, and the pixel point in {I_(S1)(x,y)} whose correspondingmark in {I_(G1)(x,y)} is 0 is a non-fuzzy pixel point.

In step (6), the acquisition process of the region growing image{I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)} comprises steps of:(6-b1) while n=128, regarding the definition tagged image {I_(D2) _(—)₁₂₈(x,y)} corresponding to the {I_(S2)(x,y)} as a starting seed image;(6-b2) studying 8 image blocks each of which having a size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if the mark of

$I_{D\; 2\_\;\frac{n}{2}}( {x,y} )$corresponding to every pixel point in the image block with the size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in {I_(S2)(x,y)}is 1, then a mark of every pixel point in the image block with the sizeof

$\frac{n}{2} \times \frac{n}{2}$at the same position in the starting seed image is set to 1; (6-b3)setting

${n = \frac{n}{2}},$and returning to step (6-b2) till n=8, here, “=” is an assignment symbolin

${n = \frac{n}{2}};$and (6-b4) while n=8, directly setting a mark of every pixel point inimage blocks in the starting seed image to 1, wherein the image blocksin the starting seed image has the same position with 8 image blocks,each of which having a size of, 4×4 adjacent to every fuzzy seed blockwith a size of 8×8 in the {I_(S2)(x,y)}; and then setting n=4, anddirectly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has the same position with 8 image blocks, each of which having asize of 2×2, adjacent to every fuzzy seed block with a size of 4×4 inthe {I_(S2)(x,y)}; and then setting n=2, and directly setting the markof 8 pixel points in the starting seed image to 1, wherein the 8 pixelpoints in the starting seed image has the same position with the 8 pixelpoints adjacent to every fuzzy seed block with a size of 2×2 in the{I_(S2)(x,y)}, thereby obtaining the region growing image {I_(G2)(x,y)}corresponding to the {I_(S2)(x,y)}, wherein the pixel point in{I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)} is 1 is a fuzzypixel point, and the pixel point in {I_(S2)(x,y)} whose correspondingmark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point.

Compared with the prior art, the present invention has some advantagesas follows. By evaluating the definition of every image block in themicroscopic image, the fuzzy degree of the microscopic image is judgedand the fuzzy seed block is determined. Then, the region growing is usedto progressively complete the accurate segmentation of the fuzzy regionand the clear region. Finally, by the fusion rule of the microscopicimage, a clear and high-quality microscopic image fused by a pluralityof microscopic images is obtained. Due to the combination of thedefinition evaluation of the microscopic image, and the segmentation ofthe fuzzy region and clear region of every microscopic image by theregion growing, the fusion result of the microscopic image of thepresent invention shows great advantages at the subjective humanperception and the objective evaluation. Furthermore, the presentinvention has simple calculation and stable result, is easy to beimplemented and adapted for fusing the digital optical microscopicimages which are shot by shallow depth of field.

These and other objectives, features, and advantages of the presentinvention will become apparent from the following detailed description,the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a general block diagram of the present invention.

FIG. 2 shows the process of the region growing.

FIG. 3 a is the first microscopic image of the cross section of thedicotyledonous stem.

FIG. 3 b is the second microscopic image of the cross section of thedicotyledonous stem.

FIG. 3 c is the first microscopic image of the epithelial tissue.

FIG. 3 d is the second microscopic image of the epithelial tissue.

FIG. 4 a shows the microscopic image whose definition is judged afterthe microscopic image shown in FIG. 3 a is divided into 128×128 imageblocks, wherein the white part at the left is the eliminated fuzzyregion which is marked by {I_(D1) _(—) ₁₂₈(x,y)}.

FIG. 4 b shows the rest microscopic image after the fuzzy region growingof the image block with the size of 64×64 shown in FIG. 4 a.

FIG. 4 c shows the rest microscopic image after the fuzzy region growingof the image block with the size of 32×32 shown in FIG. 4 b.

FIG. 4 d shows the rest microscopic image after the fuzzy region growingof the image block with the size of 16×16 shown in FIG. 4 c.

FIG. 4 e shows the rest microscopic image after the fuzzy region growingof the image block with the size of 8×8 shown in FIG. 4 d.

FIG. 4 f shows the rest microscopic image after the fuzzy region growingof the image block with the size of 4×4 shown in FIG. 4 e.

FIG. 4 g shows the rest microscopic image after the fuzzy region growingof the image block with the size of 2×2 shown in FIG. 4 f.

FIG. 4 h shows the rest microscopic image after the fuzzy region growingof the image block with the size of 1×1 shown in FIG. 4 g.

FIG. 5 is a final fusion microscopic image of the cross section of thedicotyledonous stem.

FIG. 6 is a final fusion microscopic image of the epithelial tissue.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention is further explained in detail with theaccompanying drawings.

FIG. 1 shows a flow chart of a microscopic image fusion method based onregion growing provided by the present invention. The microscopic imagefusion method based on region growing comprises steps as follows.

(1) Set {I_(S1)(x,y)} to one microscopic image collected under anoptical microscope, and set {I_(S2)(x,y)} to another microscopic imagecollected under the optical microscope, wherein 0≦x≦W−1, 0≦y≦H−1, Wdenotes the width of an image, H denotes the height of the image,I_(S1)(x,y) denotes a pixel value of a pixel point whose coordinateposition is (x,y) in the {I_(S1)(x,y)}, and I_(S2)(x,y) denotes a pixelvalue of a pixel point whose coordinate position is (x,y) in the{I_(S2)(x,y)}.

To verify the validity of the present invention, two pairs ofmicroscopic images which are shot under the condition of shallow depthof field of the optical microscope are selected in this embodiment, asshown in FIG. 3, wherein FIGS. 3 a and 3 b are two microscopic images ofthe cross section of the dicotyledonous stem, FIGS. 3 c and 3 d are twomicroscopic images of the epithelial tissue. These images are with thesize of 1024×768. It is seen that each of them has some blurringregions. In this embodiment, the microscopic image shown by FIG. 3 a is{I_(S1)(x,y)}, and the microscopic image shown by FIG. 3 b is{I_(S2)(x,y)}. Similarly, the microscopic image shown by FIG. 3 c is{I_(S1)(x,y)}, and the microscopic image shown by FIG. 3 d is{I_(S2)(x,y)}.

(2) Divide the {I_(S1)(x,y)} into

$\frac{W \times H}{n \times n}$non-overlapping first image blocks, each of which having a size of n×n,record a first image block with a coordinate position of (i,j) in the{I_(S1)(x,y)} as I_(B1) _(—) _(n)(i,j), divide the {I_(S2)(x,y)} into

$\frac{W \times H}{n \times n}$non-overlapping second image blocks, each of which having a size of n×n,and record a second image block with a coordinate position of (i,j) inthe {I_(S2)(x,y)} as I_(B2) _(—) _(n)(i,j), wherein

${0 \leq i \leq {\frac{W}{n} - 1}},{0 \leq j \leq {\frac{H}{n} - 1}},$and n is 2-power.

(3) Evaluate a definition of every first image block in the{I_(S1)(x,y)} for obtaining a definition characteristic valuecorresponding to every first image block in the {I_(S1)(x,y)}, andrecord a corresponding definition characteristic value thereof as F_(v1)_(—) _(n)(i,j) for the first image block I_(B1) _(—) _(n)(i,j) with thecoordinate position of (i,j) in the {I_(S1)(x,y)}. In the specificembodiment, the concrete process of calculating the definitioncharacteristic value F_(v1) _(—) _(n)(i,j) corresponding to the firstimage block I_(B1) _(—) _(n)(i,j) with the coordinate position of (i,j)in the {I_(S1)(x,y)} comprises steps of: (3-a1) using the improvedTenenGrad gradient function to calculate a horizontal gradient and avertical gradient of every pixel point in the I_(B1) _(—) _(n)(i,j),wherein for a pixel point with a coordinate position of (x₁,y₁) in theI_(B1) _(—) _(n)(i,j), respectively record the horizontal gradient andthe vertical gradient thereof as G_(h1)(x₁,y₁) and G_(v1)(x₁,y₁),whereinG _(h1)(x ₁ ,y ₁)=(f ₁(x ₁−1,y ₁−1)+2f ₁(x ₁ ,y ₁−1)+f ₁(x ₁+1,y₁−1))−(f ₁(x ₁−1,y ₁+1)+2f ₁(x ₁ ,y ₁+1)+f ₁(x ₁+1,y ₁+1)),G _(v1)(x ₁ ,y ₁)=(f ₁(x ₁+1,y ₁−1)+2f ₁(x ₁+1,y ₁)+f ₁(x ₁+1,y ₁+1))−(f₁(x ₁−1,y ₁−1)+2f ₁(x ₁−1,y ₁)+f ₁(x ₁−1,y ₁+1)),here, 0≦x₁≦n−1, 0≦y≦n−1, f₁(x₁−1,y₁−1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁−1,y₁−1) in the I_(B1) _(—)_(n)(i,j), f₁(x₁,y₁−1) denotes a pixel value of a pixel point with acoordinate position of (x₁,y₁−1) in the I_(B1) _(—) _(n)(i,j),f₁(x₁+1,y₁−1) denotes a pixel value of a pixel point with a coordinateposition of (x₁+1,y₁−1) in the I_(B1) _(—) _(n)(i,j), f₁(x₁−1,y₁+1)denotes a pixel value of a pixel point with a coordinate position of(x₁−1,y₁+1) in the I_(B1) _(—) _(n)(i,j), f₁(x₁,y₁+1) denotes a pixelvalue of a pixel point with a coordinate position of (x₁,y₁+1) in theI_(B1) _(—) _(n)(i,j), f₁(x₁+1,y₁+1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁+1,y₁+1) in the I_(B1) _(—)_(n)(i,j), f₁(x₁+1,y₁) denotes a pixel value of a pixel point with acoordinate position of (x₁+1,y₁) in the I_(B1) _(—) _(n)(i,j), andf₁(x₁−1,y₁) denotes a pixel value of a pixel point with a coordinateposition of (x₁−1,y₁) in the I_(B1) _(—) _(n)(i,j); and (3-a2) accordingto the horizontal gradient and the vertical gradient of every pixelpoint in the I_(B1) _(—) _(n)(i,j), calculating the definitioncharacteristic value F_(v1) _(—) _(n)(i,j) corresponding to the I_(B1)_(—) _(n)(i,j), namely, summing total sums of squares of the horizontalgradient and the vertical gradient of every pixel point in the I_(B1)_(—) _(n)(i,j) for obtaining the definition characteristic value F_(v1)_(—) _(n)(i,j) corresponding to the I_(B1) _(—) _(n)(i,j), wherein,

${F_{v\; 1{\_ n}}( {i,j} )} = {\sum\limits_{{x\; 1} = 0}^{n - 1}\;{\sum\limits_{{y\; 1} = 0}^{n - 1}\;{( {{G_{v\; 1}^{2}( {x_{1},y_{1}} )} + {G_{h\; 1}^{2}( {{x\; 1},{y\; 1}} )}} ).}}}$

Evaluate a definition of every second image block in the {I_(S2)(x,y)}for obtaining a definition characteristic value corresponding to everysecond image block in the {I_(S2)(x,y)}, and record a correspondingdefinition characteristic value thereof as F_(v2) _(—) _(n)(i,j) for thesecond image block I_(B2) _(—) _(n)(i,j) with the coordinate position of(i,j) in the {I_(S2)(x,y)}. In the specific embodiment, the concreteprocess of calculating the definition characteristic value F_(v2) _(—)_(n)(i,j) corresponding to the second image block I_(B2) _(—) _(n)(i,j)with the coordinate position of (i,j) in the {I_(S2)(x,y)} comprisessteps of: (3-b1) using the improved TenenGrad gradient function tocalculate a horizontal gradient and a vertical gradient of every pixelpoint in the I_(B2) _(—) _(n)(i,j), wherein for a pixel point with acoordinate position of (x₁,y₁) in the I_(B2) _(—) _(n)(i,j),respectively record the horizontal gradient and the vertical gradientthereof as G_(h2)(x₁,y₁) and G_(v2)(x₁,y₁), whereinG _(h2)(x ₁ ,y ₁)=(f ₂(x ₁−1,y ₁−1)+2f ₂(x ₁ ,y ₁−1)+f ₂(x ₁+1,y₁−1))−(f ₂(x ₁−1,y ₁+1)+2f ₂(x ₁ ,y ₁+1)+f ₂(x ₁+1,y ₁+1)),G _(v2)(x ₁ ,y ₁)=(f ₂(x ₁+1,y ₁−1)+2f ₂(x ₁+1,y ₁)+f ₂(x ₁+1,y ₁+1))−(f₂(x ₁−1,y ₁−1)+2f ₂(x ₁−1,y ₁)+f ₂(x ₁−1,y ₁+1))here, 0≦x₁≦n−1, 0≦y₁≦n−1, f₂(x₁−1,y₁−1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁−1,y₁−1) in the I_(B2) _(—)_(n)(i,j), f₂(x₁,y₁−1) denotes a pixel value of a pixel point with acoordinate position of (x₁,y₁−1) in the I_(B2) _(—) _(n)(i,j),f₂(x₁+1,y₁−1) denotes a pixel value of a pixel point with a coordinateposition of (x₁+1,y₁−1) in the I_(B2) _(—) _(n)(i,j), f₂(x₁−1,y₁+1)denotes a pixel value of a pixel point with a coordinate position of(x₁−1,y₁+1) in the I_(B2) _(—) _(n)(i,j), f₂(x₁,y₁+1) denotes a pixelvalue of a pixel point with a coordinate position of (x₁,y₁+1) in theI_(B2) _(—) _(n)(i,j), f₂(x₁+1,y₁+1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁+1,y₁+1) in the I_(B2) _(—)_(n)(i,j), f₂(x₁+1,y₁) denotes a pixel value of a pixel point with acoordinate position of (x₁+1,y₁) in the I_(B2) _(—) _(n)(i,j), andf₂(x₁−1,y₁) denotes a pixel value of a pixel point with a coordinateposition of (x₁−1,y₁) in the I_(B2) _(—) _(n)(i,j); and (3-b2) accordingto the horizontal gradient and the vertical gradient of every pixelpoint in the I_(B2) _(—) _(n)(i,j), calculating the definitioncharacteristic value F_(v2) _(—) _(n)(i,j) corresponding to the I_(B2)_(—) _(n)(i,j), namely, summing total sums of squares of the horizontalgradient and the vertical gradient of every pixel point in the I_(B2)_(—) _(n)(i,j) for obtaining the definition characteristic value F_(v2)_(—) _(n)(i,j) corresponding to the I_(B2) _(—) _(n)(i,j), wherein,

${F_{v\; 2{\_ n}}( {i,j} )} = {\sum\limits_{{x\; 1} = 0}^{n - 1}\;{\sum\limits_{{y\; 1} = 0}^{n - 1}\;{( {{G_{v\; 2}^{2}( {x_{1},y_{1}} )} + {G_{h\; 2}^{2}( {{x\; 1},{y\; 1}} )}} ).}}}$

(4) Determine a first decision threshold of the definitioncharacteristic value corresponding to every first image block in the{I_(S1)(x,y)}, record the first decision threshold as T_(n) _(—) ₁; andthen judge whether every first image block in the {I_(S1)(x,y)} is afuzzy seed block according to the definition characteristic valuecorresponding to every first image block in the {I_(S1)(x,y)} and thefirst decision threshold T_(n) _(—) ₁, wherein for the first image blockI_(B1) _(—) _(n)(i,j) with the coordinate position of (i,j) in the{I_(S1)(x,y)}, judge whether the definition characteristic value F_(v1)_(—) _(n)(i,j) corresponding to the I_(B1) _(—) _(n)(i,j) is smallerthan the first decision threshold T_(n) _(—) ₁, if it's OK, then judgethe I_(B1) _(—) _(n)(i,j) as the fuzzy seed block and set a mark M_(B1)_(—) _(n)(i,j) of every pixel point in the I_(B1) _(—) _(n)(i,j) to 1,if not, judge the I_(B1) _(—) _(n)(i,j) as the non-fuzzy seed block andset the mark M_(B1) _(—) _(n)(i,j) of every pixel point in the I_(B1)_(—) _(n)(i,j) to 0, namely,

${M_{B\; 1{\_ n}}( {i,j} )} = \{ \begin{matrix}{1,} & {{{if}\mspace{14mu}{F_{v\; 1{\_ n}}( {i,j} )}} < T_{{n\_}1}} \\{0,} & {{otherwise};}\end{matrix} $and then according to the mark M_(B1) _(—) _(n)(i,j) of every pixelpoint in every first image block in the {I_(S1)(x,y)}, calculate adefinition tagged image corresponding to the {I_(S1)(x,y)} and recordthe definition tagged image as {I_(D1) _(—) _(n)(x,y)}, wherein I_(D1)_(—) _(n)(x,y)=M_(B1) _(—) _(n)(int(x/n),int(y/n)), I_(D1) _(—)_(n)(x,y) denotes a mark of a pixel point with a coordinate position of(x,y) in the {I_(D1) _(—) _(n)(x,y)}, and int( ) is a rounding operator.

In the specific embodiment, the concrete process of determining thefirst decision threshold T_(n) _(—) ₁ of the definition characteristicvalue corresponding to every first image block in the {I_(S1)(x,y)}comprises steps of: (4-a1) sequencing the definition characteristicvalue corresponding to every first image block in the {I_(S1)(x,y)},finding out a maximum definition characteristic value and a minimumcharacteristic value, and respectively recording the maximum definitioncharacteristic value and the minimum characteristic value as F_(v1) _(—)_(n) _(—) _(MAX) and F_(v1) _(—) _(n) _(—) _(MIN); and (4-a2)calculating the first decision threshold T_(n) _(—) ₁, wherein T_(n)_(—) ₁=F_(v1) _(—) _(n) _(—) _(MIN)+(F_(v1) _(—) _(n) _(—) _(MAX)−F_(v1)_(—) _(n) _(—) _(MIN))×w₁, here, w₁ is a weight factor.

Determine a second decision threshold of the definition characteristicvalue corresponding to every second image block in the {I_(S2)(x,y)},record the second decision threshold as T_(n) _(—) ₂; and then judgewhether every second image block in the {I_(S2)(x,y)} is a fuzzy seedblock according to the definition characteristic value corresponding toevery second image block in the {I_(S2)(x,y)} and the second decisionthreshold T_(n) _(—) ₂, wherein for the second image block I_(B2) _(—)_(n)(i,j) with the coordinate position of (i,j) in the {I_(S2)(x,y)},judge whether the definition characteristic value F_(v2) _(—) _(n)(i,j)corresponding to the I_(B2) _(—) _(n)(i,j) is smaller than the seconddecision threshold T_(n) _(—) ₂, if it's OK, judge the I_(B2) _(—)_(n)(i,j) as the fuzzy seed block and set a mark M_(B2) _(—) _(n)(i,j)Of every pixel point in the I_(B2) _(—) _(n)(i,j) to 1, if not, judgethe I_(B2) _(—) _(n)(i,j) as the non-fuzzy seed block and set the markM_(B2) _(—) _(n)(i,j) of every pixel point in the I_(B2) _(—) _(n)(i,j)to 0, namely,

${M_{B\; 2{\_ n}}( {i,j} )} = \{ \begin{matrix}{1,} & {{{if}\mspace{14mu}{F_{v\; 2{\_ n}}( {i,j} )}} < T_{{n\_}2}} \\{0,} & {{otherwise};}\end{matrix} $and then according to the mark M_(B2) _(—) _(n)(i,j) of every pixelpoint in every second image block in the {I_(S2)(x,y)}, calculate adefinition tagged image corresponding to the {I_(S2)(x,y)} and recordthe definition tagged image as {I_(D2) _(—) _(n)(x,y)}, wherein I_(D2)_(—) _(n)(x,y)=M_(B2) _(—) _(n)(int(x/n),int(y/n)), I_(D2) _(—)_(n)(x,y) denotes a mark of a pixel point with a coordinate position of(x,y) in the {I_(D2) _(—) _(n)(x,y)}, and int( ) is a rounding operator.

In the specific embodiment, the concrete process of determining thesecond decision threshold T_(n) _(—) ₂ of the definition characteristicvalue corresponding to every second image block in the {I_(S2)(x,y)}comprises steps of: (4-b1) sequencing the definition characteristicvalue corresponding to every second image block in the {I_(S2)(x,y)},finding out a maximum definition characteristic value and a minimumcharacteristic value, and respectively recording the maximum definitioncharacteristic value and the minimum characteristic value as F_(v2) _(—)_(n) _(—) _(MAX) and F_(v2) _(—) _(n) _(—) _(MIN); and (4-b2)calculating the second decision threshold T_(n) _(—) ₂, wherein T_(n)_(—) ₂=F_(v2) _(—) _(n) _(—) _(MIN)+(F_(v2) _(—) _(n) _(—) _(MAX)−F_(v2)_(—) _(n) _(—) _(MIN))×w₂, here, w₂ is a weight factor.

The w₁ and w₂ varies with different microscopic images; while choosingw₁, the value of F_(v1) _(—) _(n) _(—) _(MAX)−F_(v1) _(—) _(n) _(—)_(MIN) should be regarded as an important reference; while choosing w₂,the value of F_(v2) _(—) _(n) _(—) _(MAX)−F_(v2) _(—) _(n) _(—) _(MIN)should be regarded as an important reference; and in this practicaloperation process, w₁=w₂=0.5.

(5) Set n=128, n=64, n=32, n=16 and n=8, respectively repeat steps (3)to (4) for obtaining a definition tagged image {I_(D1) _(—) ₁₂₈(x,y)}corresponding to the {I_(S1)(x,y)} and a definition tagged image {I_(D2)_(—) ₁₂₈(x,y)} corresponding to the {I_(S2)(x,y)} while n=128; adefinition tagged image {I_(D1) _(—) ₆₄(x,y)} corresponding to the{I_(S1)(x,y)} and a definition tagged image {I_(D2) _(—) ₆₄(x,y)}corresponding to the {I_(S2)(x,y)} while n=64; a definition tagged image{I_(D1) _(—) ₃₂(x,y)} corresponding to the {I_(S1)(x,y)} and adefinition tagged image {I_(D2) _(—) ₃₂(x,y)} corresponding to the{I_(S2)(x,y)} while n=32; a definition tagged image {I_(D1) _(—)₁₆(x,y)} corresponding to the {I_(S1)(x,y)} and a definition taggedimage {I_(D2) _(—) ₁₆(x,y)} corresponding to the {I_(S2)(x,y)} whilen=16; a definition tagged image {I_(D1) _(—) ₈(x,y)} corresponding tothe {I_(S1)(x,y)} and a definition tagged image {I_(D2) _(—) ₈(x,y)}corresponding to the {I_(S2)(x,y)} while n=8.

(6) Based on the pixel points with the mark of 1 in the obtained {I_(D1)_(—) ₁₂₈(x,y)}, {I_(D1) _(—) ₆₄(x,y)}, {I_(D1) _(—) ₃₂(x,y)}, {I_(D1)_(—) ₁₆(x,y)} and {I_(D1) _(—) ₈(x,y)} under a group of blocks withvarious sizes, make a fuzzy region growing for obtaining a regiongrowing image corresponding to the {I_(S1)(x,y)} and record the regiongrowing image as {I_(G1)(x,y)}, wherein I_(G1)(x,y) denotes a mark of apixel point with a coordinate position of (x,y) in the {I_(G1)(x,y)}.

In the specific embodiment, the acquisition process of the regiongrowing image {I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprisessteps of: (6-a1) while n=128, regarding the definition tagged image{I_(D1) _(—) ₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a startingseed image; (6-a2) studying 8 image blocks (2 image blocks respectivelyat up, down, left and right) each of which having a size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in the{I_(S1)(x,y)}, wherein if the mark

$I_{D\; 1\_\frac{n}{2}}( {x,y} )$corresponding to every pixel point in the image block with the size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in {I_(S1)(x,y)}is 1, then make a region growing, namely, a mark of every pixel point inthe image block with the size of

$\frac{n}{2} \times \frac{n}{2}$at the same position in the starting seed image is set to 1; (6-a3)setting

${n = \frac{n}{2}},$and returning to step (6-a2) till n=8, here, “=” is an assignment symbolin

${n = \frac{n}{2}};$and (6-a4) while n=8, directly setting a mark of every pixel point inimage blocks in the starting seed image to 1, wherein the image blocksin the starting seed image has the same position with 8 image blocks,each of which having a size of 4×4, adjacent to every fuzzy seed blockwith a size of 8×8 in the {I_(S1)(x,y)}; and then setting n=4, anddirectly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has the same position with 8 image blocks, each of which having asize of 2×2, adjacent to every fuzzy seed block with a size of 4×4 inthe {I_(S1)(x,y)}; and then setting n=2, and directly setting the markof 8 pixel points in the starting seed image to 1, wherein the 8 pixelpoints in the starting seed image has the same position with the 8 pixelpoints adjacent to every fuzzy seed block with a size of 2×2 in the{I_(S1)(x,y)}, thereby obtaining the region growing image {I_(G1)(x,y)}corresponding to the {I_(S1)(x,y)}, wherein the pixel point in{I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)} is 1 is a fuzzypixel point, and the pixel point in {I_(S1)(x,y)} whose correspondingmark in {I_(G1)(x,y)} is 0 is a non-fuzzy pixel point.

FIG. 2 shows the process of the region growing. The biggest block withvertical stripe in the middle denote the fuzzy seed block which isregarded as a fuzzy seed block by the definition evaluation after{I_(S1)(x,y)} is divided into first image blocks each of which havingthe size of 128×128. The blurring region grows from the fuzzy seedblock. The image blocks shown by 45° diagonal stripe in FIG. 2 are withthe size of 64×64. For each of these 64×64 image blocks, if itscorresponding mark in {I_(D1) _(—) ₆₄(x,y)} is 1, the 64×64 image blockis remarked as fuzzy seed blocks at next growing. Similarly, the imageblocks shown by 135° diagonal stripe in FIG. 2 are with the size of32×32. For each of these 32×32 image blocks, if its corresponding markin {I_(D1) _(—) ₃₂(x,y)} is 1, the 32×32 image block is remarked asfuzzy seed blocks. But if the corresponding mark in {I_(D1) _(—)₃₂(x,y)} is 0, for example the 32×32 image block at the tenth row andthe third column without stripe in FIG. 2, the 32×32 image block willnot be remarked as fuzzy seed block, thus the region growth will bestopped at this direction. The fuzzy region grows till the image blockis split into 1×1 or the corresponding marks in {I_(D1) _(—) _(n)(x,y)}of all boundary blocks are 0. In this embodiment, the microscopic imagein FIG. 3 a is divided into image blocks each of which having the sizeof 128×128 and then the definition of the image blocks is judged. Thejudged microscopic image is shown in FIG. 4 a, wherein the white part atthe left is the eliminated fuzzy region which is marked by {I_(D1) _(—)₁₂₈(x,y)}. FIGS. 4 b to 4 h are microscopic images after the regiongrowing of the blocks with various sizes in turn.

Based on the pixel points with the mark of 1 in the obtained {I_(D2)_(—) ₁₂₈(x,y)}, {I_(D2) _(—) ₆₄(x,y)}, {I_(D2) _(—) ₃₂(x,y)}, {I_(D2)_(—) ₁₆(x,y)} and {I_(D2) _(—) ₈(x,y)} under a group of blocks withvarious sizes, make a fuzzy region growing for obtaining a regiongrowing image corresponding to the {I_(S2)(x,y)} and record the regiongrowing image as {I_(G2)(x,y)}, wherein I_(G2)(x,y) denotes a mark of apixel point with a coordinate position of (x,y) in the {I_(G2)(x,y)}.

In the specific embodiment, the acquisition process of the regiongrowing image {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)} comprisessteps of: (6-b1) while n=128, regarding the definition tagged image{I_(D2) _(—) ₁₂₈(x,y)} corresponding to the {I_(S2)(x,y)} as a startingseed image; (6-b2) studying 8 image blocks each of which having a sizeof

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if the mark of

$I_{D\; 2\_\;\frac{n}{2}}( {x,y} )$corresponding to every pixel point in the image block with the size of

$\frac{n}{2} \times \frac{n}{2}$adjacent to every fuzzy seed block with the size of n×n in {I_(S2)(x,y)}is 1, then a mark of every pixel point in the image block with the sizeof

$\frac{n}{2} \times \frac{n}{2}$at the same position in the starting seed image is set to 1; (6-b3)setting

${n = \frac{n}{2}},$and returning to step (6-b2) till n=8, here, “=” is an assignment symbolin

${n = \frac{n}{2}};$and (6-b4) while n=8, directly setting a mark of every pixel point inimage blocks in the starting seed image to 1, wherein the image blocksin the starting seed image has the same position with 8 image blocks,each of which having a size of 4×4, adjacent to every fuzzy seed blockwith a size of 8×8 in the {I_(S2)(x,y)}; and then setting n=4, anddirectly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has the same position with 8 image blocks, each of which having asize of 2×2, adjacent to every fuzzy seed block with a size of 4×4 inthe {I_(S2)(x,y)}; and then setting n=2, and directly setting the markof 8 pixel points in the starting seed image to 1, wherein the 8 pixelpoints in the starting seed image has the same position with the 8 pixelpoints adjacent to every fuzzy seed block with a size of 2×2 in the{I_(S2)(x,y)}, thereby obtaining the region growing image {I_(G2)(x,y)}corresponding to the {I_(S2)(x,y)}, wherein the pixel point in{I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)} is 1 is a fuzzypixel point, and the pixel point in {I_(S2)(x,y)} whose correspondingmark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point.

(7) According to the region growing image {I_(G1)(x,y)} corresponding tothe {I_(S1)(x,y)} and the region growing image {I_(G2)(x,y)}corresponding to the {I_(S2)(x,y)}, fuse the {I_(S1)(x,y)} and the{I_(S2)(x,y)} for obtaining a final fusion microscopic image and recordthe final fusion microscopic image as {I_(F)(x,y)}, wherein

${I_{F}( {x,y} )} = \{ \begin{matrix}{{I_{S\; 1}( {x,y} )},} & {{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {{0\mspace{14mu}{and}\mspace{14mu}{I_{G\; 2}( {x,y} )}} = 1}} \\{{I_{S\; 2}( {x,y} )},} & {{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {{1\mspace{14mu}{and}\mspace{14mu}{I_{G\; 2}( {x,y} )}} = 0}} \\C & {{{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {I_{G\; 2}( {x,y} )}},}\end{matrix} $here, I_(F)(x,y) denotes a pixel value of a pixel point with acoordinate position of (x,y) in the {I_(F)(x,y)}, wherein

$C = \{ \begin{matrix}{{I_{S\; 1}( {x,y} )},} & {{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} < {C_{{nt}\; 2}( {x,y} )}} \\{{I_{S\; 2}( {x,y} )},} & {{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} > {C_{{nt}\; 2}( {x,y} )}} \\{\frac{{I_{S\; 1}( {x,y} )} + {I_{S\; 2}( {x,y} )}}{2},} & {{{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} = {C_{{nt}\; 2}( {x,y} )}},}\end{matrix} $C_(nt1)(x,y) denotes an amount of pixel points with a mark of 1 in an 8neighbor of the pixel point with a coordinate position of (x,y) in the{I_(G1)(x,y)}(namely, an amount of fuzzy pixel points), and C_(nt2)(x,y)denotes an amount of pixel points with a mark of 1 in an 8 neighbor ofthe pixel point with a coordinate position of (x,y) in the{I_(G2)(x,y)}(namely, an amount of fuzzy pixel points).

FIG. 5 is the final fusion microscopic image corresponding to FIGS. 3 aand 3 b. FIG. 6 is the final fusion microscopic image corresponding toFIGS. 3 c and 3 d. Seen from FIGS. 5 and 6, under various microscopicimages, the fusion microscopic image obtained by the present inventionhas richer detail information compared with each of the original imagesshown in FIG. 3, thereby verifying the feasibility of the presentinvention.

In the specific embodiment, four object evaluation criteria are selectedto measure objective quality of the final fusion images obtained withthe present invention. The first object evaluation criterion isTenenGrad function which reflects the texture detail information of themicroscopic image. The second object evaluation criterion is Variancefunction which reflects the integrity of the whole information of themicroscopic image. The other two object evaluation criterions are DCTfunction and Hadamard function which reflect the amount of informationin the frequency domain of the microscopic image. The larger the valuesof four selected object evaluation criteria are, the better the qualityof the fused microscopic image is, and the clearer the texture is. Table1 shows the comparison results of the objective quality of the originalmicroscopic image and the fusion microscopic image obtained by thepresent invention. Seen from Table 1, every performance index of thefusion microscopic image obtained by the present invention is better andis consistent with the subjective perception.

TABLE 1 the comparison of the object evaluation indexes of the originalmicroscopic image and the fusion microscopic image obtained by thepresent invention First Group Second Group Defi- Defi- Defi- Defi- Defi-Defi- nition nition nition nition nition nition of the 1^(st) of the2^(nd) of the of the 1^(st) of the 2^(nd) of the original original fusedoriginal original fused image image image image image image TenenGrad9.5837 7.2121 13.5728 3.7874 5.8198 7.3080 Variance 1.0379 0.9972 1.2308 6.1984 6.6823 7.1260 DCT 3.8604 3.3031  4.6264 2.0471 1.76812.4788 Hadamard 8.4318 7.1302  9.7902 3.6442 3.3301 4.5130

One skilled in the art will understand that the embodiment of thepresent invention as shown in the drawings and described above isexemplary only and not intended to be limiting.

It will thus be seen that the objects of the present invention have beenfully and effectively accomplished. Its embodiments have been shown anddescribed for the purposes of illustrating the functional and structuralprinciples of the present invention and is subject to change withoutdeparture from such principles. Therefore, this invention includes allmodifications encompassed within the spirit and scope of the followingclaims.

What is claimed is:
 1. A microscopic image fusion method based on regiongrowing, comprising steps of: (1) setting {I_(S1)(x,y)} to onemicroscopic image collected under an optical microscope, and setting{I_(S2)(x,y)} to another microscopic image collected under the opticalmicroscope, wherein 0≦x≦W−1, 0≦y≦H−1, W denotes a width of an image, Hdenotes a height of the image, I_(S1)(x,y) denotes a pixel value of apixel point whose coordinate position is (x,y) in the {I_(S1)(x,y)}, andI_(S2)(x,y) denotes a pixel value of a pixel point whose coordinateposition is (x,y) in the {I_(S2)(x,y)}; (2) dividing the {I_(S1)(x,y)}into $\frac{W \times H}{n \times n}$  non-overlapping first imageblocks, each of which having a size of n×n, recording a first imageblock with a coordinate position of (i,j) in the {I_(S1)(x,y)} as I_(B1)_(—) _(n)(i,j), dividing the {I_(S2)(x,y)} into$\frac{W \times H}{n \times n}$  non-overlapping second image blocks,each of which having a size of n×n, and recording a second image blockwith a coordinate position of (i,j) in the {I_(S2)(x,y)} as I_(B2) _(—)_(n)(i,j), wherein${0 \leq i \leq {\frac{W}{n} - 1}},{0 \leq j \leq {\frac{H}{n} - 1}},$ and n is 2-power; (3) evaluating a definition of every first imageblock in the {I_(S1)(x,y)} for obtaining a definition characteristicvalue corresponding to every first image block in the {I_(S1)(x,y)}, andrecording a corresponding definition characteristic value thereof asF_(v1) _(—) _(n)(i,j) for the first image block I_(B1) _(—) _(n)(i,j)with the coordinate position of (i,j) in the {I_(S1)(x,y)}; evaluating adefinition of every second image block in the {I_(S2)(x,y)} forobtaining a definition characteristic value corresponding to everysecond image block in the {I_(S2)(x,y)}, and recording a correspondingdefinition characteristic value thereof as F_(v2) _(—) _(n)(i,j) for thesecond image block I_(B2) _(—) _(n)(i,j) with the coordinate position of(i,j) in the {I_(S2)(x,y)}; (4) determining a first decision thresholdof the definition characteristic value corresponding to every firstimage block in the {I_(S1)(x,y)}, recording the first decision thresholdas T_(n) _(—) ₁; and then judging whether every first image block in the{I_(S1)(x,y)} is a fuzzy seed block according to the definitioncharacteristic value corresponding to every first image block in the{I_(S1)(x,y)} and the first decision threshold T_(n) _(—) ₁, wherein forthe first image block I_(B1) _(—) _(n)(i,j) with the coordinate positionof (i,j) in the {I_(S1)(x,y)}, judge whether the definitioncharacteristic value F_(v1) _(—) _(n)(i,j) corresponding to the I_(B1)_(—) _(n)(i,j) is smaller than the first decision threshold T_(n) _(—)₁, if it's OK, then judge the I_(B1) _(—) _(n)(i,j) as the fuzzy seedblock and set a mark M_(B1) _(—) _(n)(i,j) of every pixel point in theI_(B1) _(—) _(n)(i,j) to 1, if not, judge the I_(B1) _(—) _(n)(i,j) asthe non-fuzzy seed block and set the mark M_(B1) _(—) _(n)(i,j) of everypixel point in the I_(B1) _(—) _(n)(i,j) to 0; and then according to themark M_(B1) _(—) _(n)(i,j) of every pixel point in every first imageblock in the {I_(S1)(x,y)}, calculating a definition tagged imagecorresponding to the {I_(S1)(x,y)} and recording the definition taggedimage as {I_(D1) _(—) _(n)(x,y)}, wherein I_(D1) _(—) _(n)(x,y)=M_(B1)_(—) _(n)(int(x/n),int(y/n)), I_(D1) _(—) _(n)(x,y) denotes a mark of apixel point with a coordinate position of (x,y) in the {I_(D1) _(—)_(n)(x,y)}, and int( ) is a rounding operator; determining a seconddecision threshold of the definition characteristic value correspondingto every second image block in the {I_(S2)(x,y)}, recording the seconddecision threshold as T_(n) _(—) ₂; and then judging whether everysecond image block in the {I_(S2)(x,y)} is a fuzzy seed block accordingto the definition characteristic value corresponding to every secondimage block in the {I_(S2)(x,y)} and the second decision threshold T_(n)_(—) ₂, wherein for the second image block I_(B2) _(—) _(n)(i,j) withthe coordinate position of (i,j) in the {I_(S2)(x,y)}, judge whether thedefinition characteristic value F_(v2) _(—) _(n)(i,j) corresponding tothe I_(B2) _(—) _(n)(i,j) is smaller than the second decision thresholdT_(n) _(—) ₂, if it's OK, judge the I_(B2) _(—) _(n)(i,j) as the fuzzyseed block and set a mark M_(B2) _(—) _(n)(i,j) of every pixel point inthe I_(B2) _(—) _(n)(i,j) to 1, if not, judge the I_(B2) _(—) _(n)(i,j)as the non-fuzzy seed block and set the mark M_(B2) _(—) _(n)(i,j) Ofevery pixel point in the I_(B2) _(—) _(n)(i,j) to 0; and then accordingto the mark M_(B2) _(—) _(n)(i,j) Of every pixel point in every secondimage block in the {I_(S2)(x,y)}, calculating a definition tagged imagecorresponding to the {I_(S2)(x,y)} and recording the definition taggedimage as {I_(D2) _(—) _(n)(x,y)}, wherein I_(D2) _(—) _(n)(x,y)=M_(B2)_(—) _(n)(int(x/n),int(y/n)), I_(D2) _(—) _(n)(x,y) denotes a mark of apixel point with a coordinate position of (x,y) in the {I_(D2) _(—)_(n)(x,y)}, and int( ) is a rounding operator; (5) setting n=128, n=64,n=32, n=16 and n=8, respectively repeating steps (3) to (4) forobtaining a definition tagged image {I_(D1) _(—) ₁₂₈(x,y)} correspondingto the {I_(S1)(x,y)} and a definition tagged image {I_(D2) _(—)₁₂₈(x,y)} corresponding to the {I_(S2)(x,y)} while n=128; a definitiontagged image {I_(D1) _(—) ₆₄(x,y)} corresponding to the {I_(S1)(x,y)}and a definition tagged image {I_(D2) _(—) ₆₄(x,y)} corresponding to the{I_(S2)(x,y)} while n=64; a definition tagged image {I_(D1) _(—)₃₂(x,y)} corresponding to the {I_(S1)(x,y)} and a definition taggedimage {I_(D2) _(—) ₃₂(x,y)} corresponding to the {I_(S2)(x,y)} whilen=32; a definition tagged image {I_(D1) _(—) ₁₆(x,y)} corresponding tothe {I_(S1)(x,y)} and a definition tagged image {I_(D2) _(—) ₁₆(x,y)}corresponding to the {I_(S2)(x,y)} while n=16; a definition tagged image{I_(D1) _(—) ₈(x,y)} corresponding to the {I_(S1)(x,y)} and a definitiontagged image {I_(D2) _(—) ₈(x,y)} corresponding to the {I_(S2)(x,y)}while n=8; (6) based on the pixel points with the mark of 1 in the{I_(D1) _(—) ₁₂₈(x,y)}, {I_(D1) _(—) ₆₄(x,y)}, {I_(D1) _(—) ₃₂(x,y)},{I_(D1) _(—) ₁₆(x,y)} and {I_(D1) _(—) ₈(x,y)}, making a fuzzy regiongrowing for obtaining a region growing image corresponding to the{I_(S1)(x,y)} and recording the region growing image as {I_(G1)(x,y)},wherein I_(G1)(x,y) denotes a mark of a pixel point with a coordinateposition of (x,y) in the {I_(G1)(x,y)}; based on the pixel points withthe mark of 1 in the {I_(D2) _(—) ₁₂₈(x,y)}, {I_(D2) _(—) ₆₄(x,y)},{I_(D2) _(—) ₃₂(x,y)}, {I_(D2) _(—) ₁₆(x,y)} and {I_(D2) _(—) ₈(x,y)},making a fuzzy region growing for obtaining a region growing imagecorresponding to the {I_(S2)(x,y)} and recording the region growingimage as I_(G2)(x,y), wherein I_(G2)(x,y) denotes a mark of a pixelpoint with a coordinate position of (x,y) in the {I_(G2)(x,y)}; and (7)according to the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)} and the region growing image {I_(G2)(x,y)} correspondingto the {I_(S2)(x,y)}, fusing the {I_(S1)(x,y)} and the {I_(S2)(x,y)} forobtaining a final fusion microscopic image and recording the finalfusion microscopic image as {I_(F)(x,y)}, wherein${I_{F}( {x,y} )} = \{ \begin{matrix}{{I_{S\; 1}( {x,y} )},} & {{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {{0\mspace{14mu}{and}\mspace{14mu}{I_{G\; 2}( {x,y} )}} = 1}} \\{{I_{S\; 2}( {x,y} )},} & {{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {{1\mspace{14mu}{and}\mspace{14mu}{I_{G\; 2}( {x,y} )}} = 0}} \\C & {{{{if}\mspace{14mu}{I_{G\; 1}( {x,y} )}} = {I_{G\; 2}( {x,y} )}},}\end{matrix} $  here, I_(F)(x,y) denotes a pixel value of a pixelpoint with a coordinate position of (x,y) in the {I_(F)(x,y)},$C = \{ \begin{matrix}{{I_{S\; 1}( {x,y} )},} & {{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} < {C_{{nt}\; 2}( {x,y} )}} \\{{I_{S\; 2}( {x,y} )},} & {{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} > {C_{{nt}\; 2}( {x,y} )}} \\{\frac{{I_{S\; 1}( {x,y} )} + {I_{S\; 2}( {x,y} )}}{2},} & {{{{if}\mspace{14mu}{C_{{nt}\; 1}( {x,y} )}} = {C_{{nt}\; 2}( {x,y} )}},}\end{matrix} $  C_(nt1)(x,y) denotes an amount of pixel pointswith a mark of 1 in an 8 neighbor of a pixel point with a coordinateposition of (x,y) in the {I_(G1)(x,y)}, and C_(nt2)(x,y) denotes anamount of pixel points with a mark of 1 in an 8 neighbor of a pixelpoint with a coordinate position of (x,y) in the {I_(G2)(x,y)}.
 2. Themicroscopic image fusion method based on region growing, as recited inclaim 1, wherein in step (3), a concrete process of calculating thedefinition characteristic value F_(v1) _(—) _(n)(i,j) corresponding tothe first image block I_(B1) _(—) _(n)(i,j) with the coordinate positionof (i,j) in the {I_(S1)(x,y)} comprises steps of: (3-a1) using theimproved TenenGrad gradient function to calculate a horizontal gradientand a vertical gradient of every pixel point in the I_(B1) _(—)_(n)(i,j), wherein for a pixel point with a coordinate position of(x₁,y₁) in the I_(B1) _(—) _(n)(i,j), respectively record the horizontalgradient and the vertical gradient thereof as G_(h1)(x₁,y₁) andG_(v1)(x₁,y₁), whereinG _(h1)(x ₁ ,y ₁)=(f ₁(x ₁−1,y ₁−1)+2f ₁(x ₁ ,y ₁−1)+f ₁(x ₁+1,y₁−1))−(f ₁(x ₁−1,y ₁+1)+2f ₁(x ₁ ,y ₁+1)+f ₁(x ₁+1,y ₁+1)),G _(v1)(x ₁ ,y ₁)=(f ₁(x ₁+1,y ₁−1)+2f ₁(x ₁+1,y ₁)+f ₁(x ₁+1,y ₁+1))−(f₁(x ₁−1,y ₁−1)+2f ₁(x ₁−1,y ₁)+f ₁(x ₁−1,y ₁+1)), here, 0≦x₁≦n−1,0≦y₁≦n−1, f₁(x₁−1,y₁−1) denotes a pixel value of a pixel point with acoordinate position of (x₁−1,y₁−1) in the I_(B1) _(—) _(n)(i,j),f₁(x₁,y₁−1) denotes a pixel value of a pixel point with a coordinateposition of (x₁,y₁−1) in the I_(B1) _(—) _(n)(i,j), f₁(x₁+1,y₁−1)denotes a pixel value of a pixel point with a coordinate position of(x₁+1,y₁−1) in the I_(B1) _(—) _(n)(i,j), f₁(x₁−1,y₁+1) denotes a pixelvalue of a pixel point with a coordinate position of (x₁−1,y₁+1) in theI_(B1) _(—) _(n)(i,j), f₁(x₁,y₁+1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁,y₁+1) in the I_(B1) _(—)_(n)(i,j), f₁(x₁+1,y₁+1) denotes a pixel value of a pixel point with acoordinate position of (x₁+1,y₁+1) in the I_(B1) _(—) _(n)(i,j),f₁(x₁+1,y₁) denotes a pixel value of a pixel point with a coordinateposition of (x₁+1,y₁) in the I_(B1) _(—) _(n)(i,j), and f₁(x₁−1,y₁)denotes a pixel value of a pixel point with a coordinate position of(x₁−1,y₁) in the I_(B1) _(—) _(n)(i,j); and (3-a2) according to thehorizontal gradient and the vertical gradient of every pixel point inthe I_(B1) _(—) _(n)(i,j), calculating the definition characteristicvalue F_(v1) _(—) _(n)(i,j) corresponding to the I_(B1) _(—) _(n)(i,j),wherein,${{F_{v\; 1\;\_\; n}( {i,j} )} = {\sum\limits_{x_{1} = 0}^{n - 1}{\sum\limits_{y_{1} = 0}^{n - 1}( {{G_{v\; 1}^{2}( {x_{1},y_{1}} )} + {G_{h\; 1}^{2}( {{x\; 1},{y\; 1}} )}} )}}};$wherein in step (3), a concrete process of calculating the definitioncharacteristic value F_(v2) _(—) _(n)(i,j) corresponding to the secondimage block I_(B2) _(—) _(n)(i,j) with the coordinate position of (i,j)in the {I_(S2)(x,y)} comprises steps of: (3-b1) using the improvedTenenGrad gradient function to calculate a horizontal gradient and avertical gradient of every pixel point in the I_(B2) _(—) _(n)(i,j),wherein for a pixel point with a coordinate position of (x₁,y₁) in theI_(B2) _(—) _(n)(i,j), respectively record the horizontal gradient andthe vertical gradient thereof as G_(h2)(x₁,y₁) and G_(v2)(x₁,y₁),whereinG _(h2)(x ₁ ,y ₁)=(f ₂(x ₁−1,y ₁−1)+2f ₂(x ₁ ,y ₁−1)+f ₂(x ₁+1,y₁−1))−(f ₂(x ₁−1,y ₁+1)+2f ₂(x ₁ ,y ₁+1)+f ₂(x ₁+1,y ₁+1)),G _(v2)(x ₁ ,y ₁)=(f ₂(x ₁+1,y ₁−1)+2f ₂(x ₁+1,y ₁)+f ₂(x ₁+1,y ₁+1))−(f₂(x ₁−1,y ₁−1)+2f ₂(x ₁−1,y ₁)+f ₂(x ₁−1,y ₁+1)) here, 0≦x₁≦n−1,0≦y₁≦n−1, f₂(x₁−1,y₁−1) denotes a pixel value of a pixel point with acoordinate position of (x₁−1,y₁−1) in the I_(B2) _(—) _(n)(i,j),f₂(x₁,y₁−1) denotes a pixel value of a pixel point with a coordinateposition of (x₁,y₁−1) in the I_(B2) _(—) _(n)(i,j), f₂(x₁+1,y₁−1)denotes a pixel value of a pixel point with a coordinate position of(x₁+1,y₁−1) in the I_(B2) _(—) _(n)(i,j), f₂(x₁−1,y₁+1) denotes a pixelvalue of a pixel point with a coordinate position of (x₁−1,y₁+1) in theI_(B2) _(—) _(n)(i,j), f₂(x₁,y₁+1) denotes a pixel value of a pixelpoint with a coordinate position of (x₁,y₁+1) in the I_(B2) _(—)_(n)(i,j), f₂(x₁+1,y₁+1) denotes a pixel value of a pixel point with acoordinate position of (x₁+1,y₁+1) in the I_(B2) _(—) _(n)(i,j),f₂(x₁+1,y₁) denotes a pixel value of a pixel point with a coordinateposition of (x₁+1,y₁) in the I_(B2) _(—) _(n)(i,j), and f₂(x₁−1,y₁)denotes a pixel value of a pixel point with a coordinate position of(x₁−1,y₁) in the I_(B2) _(—) _(n)(i,j); and (3-b2) according to thehorizontal gradient and the vertical gradient of every pixel point inthe I_(B2) _(—) _(n)(i,j), calculating the definition characteristicvalue F_(v2) _(—) _(n)(i,j) corresponding to the I_(B2) _(—) _(n)(i,j)wherein,${F_{v\; 2\_\; n}( {i,j} )} = {\sum\limits_{\;{x_{1} = 0}}^{n - 1}{\sum\limits_{y_{1} = 0}^{n - 1}{( {{G_{v\; 2}^{2}( {x_{1},y_{1}} )} + {G_{h\; 2}^{2}( {{x\; 1},{y\; 1}} )}} ).}}}$3. The microscopic image fusion method based on region growing, asrecited in claim 1, wherein in step (4), a concrete process ofdetermining the first decision threshold T_(n) _(—) ₁ of the definitioncharacteristic value corresponding to every first image block in the{I_(S1)(x,y)} comprises steps of: (4-a1) sequencing the definitioncharacteristic value corresponding to every first image block in the{I_(S1)(x,y)}, finding out a maximum definition characteristic value anda minimum characteristic value, and respectively recording the maximumdefinition characteristic value and the minimum characteristic value asF_(v1) _(—) _(n) _(—) _(MAX) and F_(v1) _(—) _(n) _(—) _(MIN); and(4-a2) calculating the first decision threshold T_(n) _(—) ₁, whereinT_(n) _(—) ₁=F_(v1) _(—) _(n) _(—) _(MIN)+(F_(v1) _(—) _(n) _(—)_(MAX)−F_(v1) _(—) _(n) _(—) _(MIN))×w₁, here, w₁ is a weight factor;wherein in step (4), the concrete process of determining the seconddecision threshold T_(n) _(—) ₂ of the definition characteristic valuecorresponding to every second image block in the {I_(S2)(x,y)} comprisessteps of: (4-b1) sequencing the definition characteristic valuecorresponding to every second image block in the {I_(S2)(x,y)}, findingout a maximum definition characteristic value and a minimumcharacteristic value, and respectively recording the maximum definitioncharacteristic value and the minimum characteristic value as F_(v2) _(—)_(n) _(—) _(MAX) and F_(v2) _(—) _(n) _(—) _(MIN); and (4-b2)calculating the second decision threshold T_(n) _(—) ₂, wherein T_(n)_(—) ₂=F_(v2) _(—) _(n) _(—) _(MIN)+(F_(v2) _(—) _(n) _(—) _(MAX)−F_(v2)_(—) _(n) _(—) _(MIN))×w₂, here, w₂ is a weight factor.
 4. Themicroscopic image fusion method based on region growing, as recited inclaim 2, wherein in step (4), a concrete process of determining thefirst decision threshold T_(n) _(—) ₁ of the definition characteristicvalue corresponding to every first image block in the {I_(S1)(x,y)}comprises steps of: (4-a1) sequencing the definition characteristicvalue corresponding to every first image block in the {I_(S1)(x,y)},finding out a maximum definition characteristic value and a minimumcharacteristic value, and respectively recording the maximum definitioncharacteristic value and the minimum characteristic value as F_(v1) _(—)_(n) _(—) _(MAX) and F_(v1) _(—) _(n) _(—) _(MIN); and (4-a2)calculating the first decision threshold T_(n) _(—) ₁, wherein T_(n)_(—) ₁=F_(v1) _(—) _(n) _(—) _(MIN)+(F_(v1) _(—) _(n) _(—) _(MAX)−F_(v1)_(—) _(n) _(—) _(MIN))×w₁, here, w₁ is a weight factor; wherein in step(4), the concrete process of determining the second decision thresholdT_(n) _(—) ₂ of the definition characteristic value corresponding toevery second image block in the {I_(S2)(x,y)} comprises steps of: (4-b1)sequencing the definition characteristic value corresponding to everysecond image block in the {I_(S2)(x,y)}, finding out a maximumdefinition characteristic value and a minimum characteristic value, andrespectively recording the maximum definition characteristic value andthe minimum characteristic value as F_(v2) _(—) _(n) _(—) _(MAX) andF_(v2) _(—) _(n) _(—) _(MIN); and (4-b2) calculating the second decisionthreshold T_(n) _(—) ₂, wherein T_(n) _(—) ₂=F_(v2) _(—) _(n) _(—)_(MIN)+(F_(v2) _(—) _(n) _(—) _(MAX)−F_(v2) _(—) _(n) _(—) _(MIN))×w₂,here, w₂ is a weight factor.
 5. The microscopic image fusion methodbased on region growing, as recited in claim 3, wherein in (4-a2) ofstep (4), 0.4≦w₁≦0.6; and in (4-b2) of step (4), 0.4≦w₂≦0.6.
 6. Themicroscopic image fusion method based on region growing, as recited inclaim 4, wherein in (4-a2) of step (4), 0.4≦w₁≦0.6; and in (4-b2) ofstep (4), 0.4≦w₂≦0.6.
 7. The microscopic image fusion method based onregion growing, as recited in claim 1, wherein in step (6), theacquisition process of the region growing image {I_(G1)(x,y)}corresponding to the {I_(S1)(x,y)} comprises steps of: (6-a1) whilen=128, regarding the definition tagged image {I_(D1) _(—) ₁₂₈(x,y)}corresponding to the {I_(S1)(x,y)} as a starting seed image; (6-a2)studying 8 image blocks each of which having a size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in the {I_(S1)(x,y)}, wherein if a mark$I_{D\; 1\_\;\frac{n}{2}}( {x,y} )$ corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in {I_(S1)(x,y)} is 1, then a mark of every pixel pointin the image block with the size of $\frac{n}{2} \times \frac{n}{2}$ atthe same position in the starting seed image is set to 1; (6-a3) setting${n = \frac{n}{2}},$ and returning to step (6-a2) till n=8, here, “=” isan assignment symbol in ${n = \frac{n}{2}};$ and (6-a4) while n=8,directly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has a same position with 8 image blocks, each of which having asize of 4×4, adjacent to every fuzzy seed block with a size of 8×8 inthe {I_(S1)(x,y)}; and then setting n=4, and directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 2×2, adjacent toevery fuzzy seed block with a size of 4×4 in the {I_(S1)(x,y)}; and thensetting n=2, and directly setting a mark of 8 pixel points in thestarting seed image to 1, wherein the 8 pixel points in the startingseed image has a same position with the 8 pixel points adjacent to everyfuzzy seed block with a size of 2×2 in the {I_(S1)(x,y)}, therebyobtaining the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)}, wherein the pixel point in {I_(S1)(x,y)} whosecorresponding mark in {I_(G1)(x,y)} is 1 is a fuzzy pixel point, and thepixel point in {I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)}is 0 is a non-fuzzy pixel point; wherein in step (6), the acquisitionprocess of the region growing image {I_(G2)(x,y)} corresponding to the{I_(S2)(x,y)} comprises steps of: (6-b1) while n=128, regarding thedefinition tagged image {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the{I_(S2)(x,y)} as a starting seed image; (6-b2) studying 8 image blockseach of which having a size of $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if a mark of$I_{D\; 2\_\;\frac{n}{2}}( {x,y} )$  corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  adjacent to every fuzzy seed blockwith the size of n×n in {I_(S2)(x,y)} is 1, then a mark of every pixelpoint in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  at the same position in the startingseed image is set to 1; (6-b3) setting ${n = \frac{n}{2}},$  andreturning to step (6-b2) till n=8, here, “=” is an assignment symbol in${n = \frac{n}{2}};$  and (6-b4) while n=8, directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 4×4, adjacent toevery fuzzy seed block with a size of 8×8 in the {I_(S2)(x,y)}; and thensetting n=4, and directly setting a mark of every pixel point in imageblocks in the starting seed image to 1, wherein the image blocks in thestarting seed image has a same position with 8 image blocks, each ofwhich having a size of 2×2, adjacent to every fuzzy seed block with asize of 4×4 in the {I_(S2)(x,y)}; and then setting n=2, and directlysetting a mark of 8 pixel points in the starting seed image to 1,wherein the 8 pixel points in the starting seed image has a sameposition with the 8 pixel points adjacent to every fuzzy seed block witha size of 2×2 in the {I_(S2)(x,y)}, thereby obtaining the region growingimage {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)}, wherein thepixel point in {I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)}is 1 is a fuzzy pixel point, and the pixel point in {I_(S2)(x,y)} whosecorresponding mark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point. 8.The microscopic image fusion method based on region growing, as recitedin claim 2, wherein in step (6), the acquisition process of the regiongrowing image {I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprisessteps of: (6-a1) while n=128, regarding the definition tagged image{I_(D1) _(—) ₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a startingseed image; (6-a2) studying 8 image blocks each of which having a sizeof $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed blockwith the size of n×n in the {I_(S1)(x,y)}, wherein if a mark$I_{D\; 1\_\frac{n}{2}}( {x,y} )$ corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in {I_(S1)(x,y)} is 1, then a mark of every pixel pointin the image block with the size of $\frac{n}{2} \times \frac{n}{2}$ atthe same position in the starting seed image is set to 1; (6-a3) setting${n = \frac{n}{2}},$ and returning to step (6-a2) till n=8, here, “=” isan assignment symbol in ${n = \frac{n}{2}};$ and (6-a4) while n=8,directly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has a same position with 8 image blocks, each of which having asize of 4×4, adjacent to every fuzzy seed block with a size of 8×8 inthe {I_(S1)(x,y)}; and then setting n=4, and directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 2×2, adjacent toevery fuzzy seed block with a size of 4×4 in the {I_(S1)(x,y)}; and thensetting n=2, and directly setting a mark of 8 pixel points in thestarting seed image to 1, wherein the 8 pixel points in the startingseed image has a same position with the 8 pixel points adjacent to everyfuzzy seed block with a size of 2×2 in the {I_(S1)(x,y)}, therebyobtaining the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)}, wherein the pixel point in {I_(S1)(x,y)} whosecorresponding mark in {I_(G1)(x,y)} is 1 is a fuzzy pixel point, and thepixel point in {I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)}is 0 is a non-fuzzy pixel point; wherein in step (6), the acquisitionprocess of the region growing image {I_(G2)(x,y)} corresponding to the{I_(S2)(x,y)} comprises steps of: (6-b1) while n=128, regarding thedefinition tagged image {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the{I_(S2)(x,y)} as a starting seed image; (6-b2) studying 8 image blockseach of which having a size of $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if a mark of$I_{D\; 2\_\;\frac{n}{2\;}}( {x,y} )$  corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  adjacent to every fuzzy seed blockwith the size of n×n in {I_(S2)(x,y)} is 1, then a mark of every pixelpoint in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  at the same position in the startingseed image is set to 1; (6-b3) setting ${n = \frac{n}{2}},$  andreturning to step (6-b2) till n=8, here, “=” is an assignment symbol in${n = \frac{n}{2}};$  and (6-b4) while n=8, directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 4×4, adjacent toevery fuzzy seed block with a size of 8×8 in the {I_(S2)(x,y)}; and thensetting n=4, and directly setting a mark of every pixel point in imageblocks in the starting seed image to 1, wherein the image blocks in thestarting seed image has a same position with 8 image blocks, each ofwhich having a size of 2×2, adjacent to every fuzzy seed block with asize of 4×4 in the {I_(S2)(x,y)}; and then setting n=2, and directlysetting a mark of 8 pixel points in the starting seed image to 1,wherein the 8 pixel points in the starting seed image has a sameposition with the 8 pixel points adjacent to every fuzzy seed block witha size of 2×2 in the {I_(S2)(x,y)}, thereby obtaining the region growingimage {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)}, wherein thepixel point in {I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)}is 1 is a fuzzy pixel point, and the pixel point in {I_(S2)(x,y)} whosecorresponding mark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point. 9.The microscopic image fusion method based on region growing, as recitedin claim 3, wherein in step (6), the acquisition process of the regiongrowing image {I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprisessteps of: (6-a1) while n=128, regarding the definition tagged image{I_(D1) _(—) ₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a startingseed image; (6-a2) studying 8 image blocks each of which having a sizeof $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed blockwith the size of n×n in the {I_(S1)(x,y)}, wherein if a mark$I_{D\; 2\_\;\frac{n}{2\;}}( {x,y} )$ corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in {I_(S1)(x,y)} is 1, then a mark of every pixel pointin the image block with the size of $\frac{n}{2} \times \frac{n}{2}$ atthe same position in the starting seed image is set to 1; (6-a3) setting${n = \frac{n}{2}},$ and returning to step (6-a2) till n=8, here, “=” isan assignment symbol in ${n = \frac{n}{2}};$ and (6-a4) while n=8,directly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has a same position with 8 image blocks, each of which having asize of 4×4, adjacent to every fuzzy seed block with a size of 8×8 inthe {I_(S1)(x,y)}; and then setting n=4, and directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 2×2, adjacent toevery fuzzy seed block with a size of 4×4 in the {I_(S1)(x,y)}; and thensetting n=2, and directly setting a mark of 8 pixel points in thestarting seed image to 1, wherein the 8 pixel points in the startingseed image has a same position with the 8 pixel points adjacent to everyfuzzy seed block with a size of 2×2 in the {I_(S1)(x,y)}, therebyobtaining the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)}, wherein the pixel point in {I_(S1)(x,y)} whosecorresponding mark in {I_(G1)(x,y)} is 1 is a fuzzy pixel point, and thepixel point in {I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)}is 0 is a non-fuzzy pixel point; wherein in step (6), the acquisitionprocess of the region growing image {I_(G2)(x,y)} corresponding to the{I_(S2)(x,y)} comprises steps of: (6-b1) while n=128, regarding thedefinition tagged image {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the{I_(S2)(x,y)} as a starting seed image; (6-b2) studying 8 image blockseach of which having a size of $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if a mark of$I_{D\; 2\_\;\frac{n}{2}}( {x,y} )$  corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  adjacent to every fuzzy seed blockwith the size of n×n in {I_(S2)(x,y)} is 1, then a mark of every pixelpoint in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  at the same position in the startingseed image is set to 1; (6-b3) setting ${n = \frac{n}{2}},$  andreturning to step (6-b2) till n=8, here, “=” is an assignment symbol in${n = \frac{n}{2}};$  and (6-b4) while n=8, directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 4×4, adjacent toevery fuzzy seed block with a size of 8×8 in the {I_(S2)(x,y)}; and thensetting n=4, and directly setting a mark of every pixel point in imageblocks in the starting seed image to 1, wherein the image blocks in thestarting seed image has a same position with 8 image blocks, each ofwhich having a size of 2×2, adjacent to every fuzzy seed block with asize of 4×4 in the {I_(S2)(x,y)}; and then setting n=2, and directlysetting a mark of 8 pixel points in the starting seed image to 1,wherein the 8 pixel points in the starting seed image has a sameposition with the 8 pixel points adjacent to every fuzzy seed block witha size of 2×2 in the {I_(S2)(x,y)}, thereby obtaining the region growingimage {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)}, wherein thepixel point in {I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)}is 1 is a fuzzy pixel point, and the pixel point in {I_(S2)(x,y)} whosecorresponding mark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point. 10.The microscopic image fusion method based on region growing, as recitedin claim 4, wherein in step (6), the acquisition process of the regiongrowing image {I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprisessteps of: (6-a1) while n=128, regarding the definition tagged image{I_(D1) _(—) ₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a startingseed image; (6-a2) studying 8 image blocks each of which having a sizeof $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed blockwith the size of n×n in the {I_(S1)(x,y)}, wherein if a mark$I_{D\; 1\_\;\frac{n}{2}}( {x,y} )$ corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in {I_(S1)(x,y)} is 1, then a mark of every pixel pointin the image block with the size of $\frac{n}{2} \times \frac{n}{2}$ atthe same position in the starting seed image is set to 1; (6-a3) setting${n = \frac{n}{2}},$ and returning to step (6-a2) till n=8, here, “=” isan assignment symbol in ${n = \frac{n}{2}};$ and (6-a4) while n=8,directly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has a same position with 8 image blocks, each of which having asize of 4×4, adjacent to every fuzzy seed block with a size of 8×8 inthe {I_(S1)(x,y)}; and then setting n=4, and directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 2×2, adjacent toevery fuzzy seed block with a size of 4×4 in the {I_(S1)(x,y)}; and thensetting n=2, and directly setting a mark of 8 pixel points in thestarting seed image to 1, wherein the 8 pixel points in the startingseed image has a same position with the 8 pixel points adjacent to everyfuzzy seed block with a size of 2×2 in the {I_(S1)(x,y)}, therebyobtaining the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)}, wherein the pixel point in {I_(S1)(x,y)} whosecorresponding mark in {I_(G1)(x,y)} is 1 is a fuzzy pixel point, and thepixel point in {I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)}is 0 is a non-fuzzy pixel point; wherein in step (6), the acquisitionprocess of the region growing image {I_(G2)(x,y)} corresponding to the{I_(S2)(x,y)} comprises steps of: (6-b1) while n=128, regarding thedefinition tagged image {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the{I_(S2)(x,y)} as a starting seed image; (6-b2) studying 8 image blockseach of which having a size of $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if a mark of$I_{D\; 2\_\;\frac{n}{2}}( {x,y} )$  corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  adjacent to every fuzzy seed blockwith the size of n×n in {I_(S2)(x,y)} is 1, then a mark of every pixelpoint in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  at the same position in the startingseed image is set to 1; (6-b3) setting ${n = \frac{n}{2}},$  andreturning to step (6-b2) till n=8, here, “=” is an assignment symbol in${n = \frac{n}{2}};$  and (6-b4) while n=8, directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 4×4, adjacent toevery fuzzy seed block with a size of 8×8 in the {I_(S2)(x,y)}; and thensetting n=4, and directly setting a mark of every pixel point in imageblocks in the starting seed image to 1, wherein the image blocks in thestarting seed image has a same position with 8 image blocks, each ofwhich having a size of 2×2, adjacent to every fuzzy seed block with asize of 4×4 in the {I_(S2)(x,y)}; and then setting n=2, and directlysetting a mark of 8 pixel points in the starting seed image to 1,wherein the 8 pixel points in the starting seed image has a sameposition with the 8 pixel points adjacent to every fuzzy seed block witha size of 2×2 in the {I_(S2)(x,y)}, thereby obtaining the region growingimage {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)}, wherein thepixel point in {I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)}is 1 is a fuzzy pixel point, and the pixel point in {I_(S2)(x,y)} whosecorresponding mark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point. 11.The microscopic image fusion method based on region growing, as recitedin claim 5, wherein in step (6), the acquisition process of the regiongrowing image {I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprisessteps of: (6-a1) while n=128, regarding the definition tagged image{I_(D1) _(—) ₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a startingseed image; (6-a2) studying 8 image blocks each of which having a sizeof $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed blockwith the size of n×n in the {I_(S1)(x,y)}, wherein if a mark$I_{D\; 1\;\_\;\frac{n}{2}}( {x,y} )$ corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in {I_(S1)(x,y)} is 1, then a mark of every pixel pointin the image block with the size of $\frac{n}{2} \times \frac{n}{2}$ atthe same position in the starting seed image is set to 1; (6-a3) setting${n = \frac{n}{2}},$ and returning to step (6-a2) till n=8, here, “=” isan assignment symbol in ${n = \frac{n}{2}};$ and (6-a4) while n=8,directly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has a same position with 8 image blocks, each of which having asize of 4×4, adjacent to every fuzzy seed block with a size of 8×8 inthe {I_(S1)(x,y)}; and then setting n=4, and directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 2×2, adjacent toevery fuzzy seed block with a size of 4×4 in the {I_(S1)(x,y)}; and thensetting n=2, and directly setting a mark of 8 pixel points in thestarting seed image to 1, wherein the 8 pixel points in the startingseed image has a same position with the 8 pixel points adjacent to everyfuzzy seed block with a size of 2×2 in the {I_(S1)(x,y)}, therebyobtaining the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)}, wherein the pixel point in {I_(S1)(x,y)} whosecorresponding mark in {I_(G1)(x,y)} is 1 is a fuzzy pixel point, and thepixel point in {I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)}is 0 is a non-fuzzy pixel point; wherein in step (6), the acquisitionprocess of the region growing image {I_(G2)(x,y)} corresponding to the{I_(S2)(x,y)} comprises steps of: (6-b1) while n=128, regarding thedefinition tagged image {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the{I_(S2)(x,y)} as a starting seed image; (6-b2) studying 8 image blockseach of which having a size of $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if a mark$I_{D\; 2\;\_\;\frac{n}{2}}( {x,y} )$  corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  adjacent to every fuzzy seed blockwith the size of n×n in {I_(S2)(x,y)} is 1, then a mark of every pixelpoint in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  at the same position in the startingseed image is set to 1; (6-b3) setting ${n = \frac{n}{2}},$  andreturning to step (6-b2) till n=8, here, “=” is an assignment symbol in${n = \frac{n}{2}};$  and (6-b4) while n=8, directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 4×4, adjacent toevery fuzzy seed block with a size of 8×8 in the {I_(S2)(x,y)}; and thensetting n=4, and directly setting a mark of every pixel point in imageblocks in the starting seed image to 1, wherein the image blocks in thestarting seed image has a same position with 8 image blocks, each ofwhich having a size of 2×2, adjacent to every fuzzy seed block with asize of 4×4 in the {I_(S2)(x,y)}; and then setting n=2, and directlysetting a mark of 8 pixel points in the starting seed image to 1,wherein the 8 pixel points in the starting seed image has a sameposition with the 8 pixel points adjacent to every fuzzy seed block witha size of 2×2 in the {I_(S2)(x,y)}, thereby obtaining the region growingimage {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)}, wherein thepixel point in {I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)}is 1 is a fuzzy pixel point, and the pixel point in {I_(S2)(x,y)} whosecorresponding mark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point. 12.The microscopic image fusion method based on region growing, as recitedin claim 6, wherein in step (6), the acquisition process of the regiongrowing image {I_(G1)(x,y)} corresponding to the {I_(S1)(x,y)} comprisessteps of: (6-a1) while n=128, regarding the definition tagged image{I_(D1) _(—) ₁₂₈(x,y)} corresponding to the {I_(S1)(x,y)} as a startingseed image; (6-a2) studying 8 image blocks each of which having a sizeof $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed blockwith the size of n×n in the {I_(S1)(x,y)}, wherein if a mark$I_{D\; 1\_\frac{n}{2}}( {x,y} )$ corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block withthe size of n×n in {I_(S1)(x,y)} is 1, then a mark of every pixel pointin the image block with the size of $\frac{n}{2} \times \frac{n}{2}$ atthe same position in the starting seed image is set to 1; (6-a3) setting${n = \frac{n}{2}},$ and returning to step (6-a2) till n=8, here, “=” isan assignment symbol in ${n = \frac{n}{2}};$ and (6-a4) while n=8,directly setting a mark of every pixel point in image blocks in thestarting seed image to 1, wherein the image blocks in the starting seedimage has a same position with 8 image blocks, each of which having asize of 4×4, adjacent to every fuzzy seed block with a size of 8×8 inthe {I_(S1)(x,y)}; and then setting n=4, and directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 2×2, adjacent toevery fuzzy seed block with a size of 4×4 in the {I_(S1)(x,y)}; and thensetting n=2, and directly setting a mark of 8 pixel points in thestarting seed image to 1, wherein the 8 pixel points in the startingseed image has a same position with the 8 pixel points adjacent to everyfuzzy seed block with a size of 2×2 in the {I_(S1)(x,y)}, therebyobtaining the region growing image {I_(G1)(x,y)} corresponding to the{I_(S1)(x,y)}, wherein the pixel point in {I_(S1)(x,y)} whosecorresponding mark in {I_(G1)(x,y)} is 1 is a fuzzy pixel point, and thepixel point in {I_(S1)(x,y)} whose corresponding mark in {I_(G1)(x,y)}is 0 is a non-fuzzy pixel point; wherein in step (6), the acquisitionprocess of the region growing image {I_(G2)(x,y)} corresponding to the{I_(S2)(x,y)} comprises steps of: (6-b1) while n=128, regarding thedefinition tagged image {I_(D2) _(—) ₁₂₈(x,y)} corresponding to the{I_(S2)(x,y)} as a starting seed image; (6-b2) studying 8 image blockseach of which having a size of $\frac{n}{2} \times \frac{n}{2}$ adjacent to every fuzzy seed block with the size of n×n in the{I_(S2)(x,y)}, wherein if a mark$I_{D\; 2\_\;\frac{n}{2}}( {x,y} )$  corresponding to everypixel point in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  adjacent to every fuzzy seed blockwith the size of n×n in {I_(S2)(x,y)} is 1, then a mark of every pixelpoint in the image block with the size of$\frac{n}{2} \times \frac{n}{2}$  at the same position in the startingseed image is set to 1; (6-b3) setting ${n = \frac{n}{2}},$  andreturning to step (6-b2) till n=8, here, “=” is an assignment symbol in${n = \frac{n}{2}};$  and (6-b4) while n=8, directly setting a mark ofevery pixel point in image blocks in the starting seed image to 1,wherein the image blocks in the starting seed image has a same positionwith 8 image blocks, each of which having a size of 4×4, adjacent toevery fuzzy seed block with a size of 8×8 in the {I_(S2)(x,y)}; and thensetting n=4, and directly setting a mark of every pixel point in imageblocks in the starting seed image to 1, wherein the image blocks in thestarting seed image has a same position with 8 image blocks, each ofwhich having a size of 2×2, adjacent to every fuzzy seed block with asize of 4×4 in the {I_(S2)(x,y)}; and then setting n=2, and directlysetting a mark of 8 pixel points in the starting seed image to 1,wherein the 8 pixel points in the starting seed image has a sameposition with the 8 pixel points adjacent to every fuzzy seed block witha size of 2×2 in the {I_(S2)(x,y)}, thereby obtaining the region growingimage {I_(G2)(x,y)} corresponding to the {I_(S2)(x,y)}, wherein thepixel point in {I_(S2)(x,y)} whose corresponding mark in {I_(G2)(x,y)}is 1 is a fuzzy pixel point, and the pixel point in {I_(S2)(x,y)} whosecorresponding mark in {I_(G2)(x,y)} is 0 is a non-fuzzy pixel point.